Propagation of Flexural Mode AE Signals in GR/EP Composite Plates
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It has been documented that AE signals propagate in thin plates as extensional and flexural plate modes. This was demonstrated using simulated AE sources (pencil lead breaks) by Gorman on thin aluminum and gr/ep composite plates and by Gorman and Prosser on thin aluminum plates. A typical signal from a pencil lead break source which identifies these two modes is shown. AE signals from transverse matrix cracking sources in gr/ep composite plates were also shown to propagate as plate modes by Gorman and Ziola. Smith showed that crack growth events in thin aluminum plates under spectrum fatigue loading produced signals that propagated as plate modes. Additionally, Prosser et al. showed that AE signals propagated as plate modes in a thin walled composite tube.
Fourth International Symposium on Acoustic Emission from Composite Materials; 1992; UnknownApproved for public release, distribution unlimited
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Gorman, Michael R. (Acoustical Society of America, 1991-07);Plate theory is more easily applied to the analysis of composite laminates than exact three‐dimensional elasticity theory. Under conditions such that plate theory is applicable, it is suggested that plate waves are useful ...
Gorman, Michael R.; Prosser, William H. (1991);Lead breaks (Hsu-Neilsen source) were used to generate simulated acoustic emission signals in an aluminum plate at angles of 0, 30, 60, and 90 degrees with respect to the plane of the plate. This was accomplished by ...
Prosser, William H.; Dorighi, John; Gorman, Michael R. (Technomic Publishing Company, Inc., 1992);Simulated acoustic emission signals were induced in a thin-walled graphite/epoxy tube by means of lead breaks (Hsu-Neilsen source). the tube is of similar materials and layup to be used by NASA in fabricating the struts ...